request train if ext tank full

only one input and output? they are balancers right...so can they be more than one or it wont work in that case?

I'm not sure I fully understand your question, but if you're asking whether it supports more than 900/min, then the answer is probably no.(need testing, I'm not sure)

you got me just right.... been trying to increase the throughput of this piece of alien engineering (without using multiple of this blueprint) but even my last brain cell quit trying to figure it out